Are you referencing my answer? OP has not specified the platform that they're using. I've made the assumption that they're referencing the Illumina Infinitum HumanMethylation450K assay, as it's the most commonly used for methylation microarrays, and Illumina don't offer this for anything other than human (as far as I'm aware). OP could be referencing bisulphite sequencing, in which case, the input for some test methods takes an iRange object. An iRange object could be made for the given species.